Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 7: Topological insulators I (joint session HL/TT)

HL 7.11: Vortrag

Montag, 12. März 2018, 12:15–12:30, A 151

Exploiting Topological Insulators for Majorana Devices — •Peter Schüffelgen1, Daniel Rosenbach1, Chuan Li2, Michael Schleenvoigt1, Tobias Schmitt1, Sarah Schmitt1, Abdur Jalil1, Jonas Kölzer1, Lidia Kibkalo1, Benjamin Bennemann1, Umut Parlak1, Martina Luysberg1, Gregor Mussler1, Alexander Golubov2, Alexander Brinkman2, Thomas Schäpers1, and Detlev Grützmacher11Peter Grünberg Institut, Forschungszentrum Jülich, D-52425 Jülich, Germany — 2MESA+ Institute for Nanotechnology, University of Twente, 7500AE Enschede, The Netherlands

At the interface of s-wave superconductors (SC) and topological insulators (TI) exotic Majorana modes are predicted to occur. In this work, a novel fabrication technique is presented, which allows to construct TI-SC hybrid devices of high quality under ultra-high vacuum conditions. A stencil mask is applied to the substrate before growth of Bi-based TI thin films by means of molecular beam epitaxy. The shadow mask is used for stencil lithography of superconductive electrodes on top of the topological thin film in a second growth step. Measurements on such in-situ fabricated Josephson junctions indicate a high interface transparency. Furthermore, a missing first Shapiro step was detected in radio frequency experiments, indicating signatures of gapless Andreev bound states, so-called Majorana bound states. The presented process is applicable to a variety of new geometries, allowing fabrication of elaborated TI-SC hybrid devices, for further research on Majorana signatures.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2018 > Berlin